Add project files.

MultiTerm.Core/MultiTerm.Core.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

MultiTerm.Wpf/App.xaml

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+<Application x:Class="MultiTerm.Wpf.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:MultiTerm.Wpf"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

MultiTerm.Wpf/App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace MultiTerm.Wpf
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

MultiTerm.Wpf/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

MultiTerm.Wpf/MainWindow.xaml

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+<Window x:Class="MultiTerm.Wpf.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:MultiTerm.Wpf"
+        mc:Ignorable="d"
+        Title="MultiTerm" Height="450" Width="800">
+    <Grid>
+
+    </Grid>
+</Window>

MultiTerm.Wpf/MainWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace MultiTerm.Wpf
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

MultiTerm.Wpf/MultiTerm.Wpf.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+</Project>

MultiTerm.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33424.131
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MultiTerm.Wpf", "MultiTerm.Wpf\MultiTerm.Wpf.csproj", "{1C18608F-596A-47ED-9BD6-96E5E52E6E88}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MultiTerm.Core", "MultiTerm.Core\MultiTerm.Core.csproj", "{A4ED5CBB-954E-4F23-B9CB-8E30DF7B8F48}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{1C18608F-596A-47ED-9BD6-96E5E52E6E88}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1C18608F-596A-47ED-9BD6-96E5E52E6E88}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1C18608F-596A-47ED-9BD6-96E5E52E6E88}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1C18608F-596A-47ED-9BD6-96E5E52E6E88}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A4ED5CBB-954E-4F23-B9CB-8E30DF7B8F48}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A4ED5CBB-954E-4F23-B9CB-8E30DF7B8F48}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A4ED5CBB-954E-4F23-B9CB-8E30DF7B8F48}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A4ED5CBB-954E-4F23-B9CB-8E30DF7B8F48}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1E23E586-1D9C-4E0E-91C6-A9F7B254FC74}
+	EndGlobalSection
+EndGlobal